Because P and S waves travel at different but fairly constant speeds, the interval between their arrivals increases in proportion to the distance from the earthquake focus, or initial rupture point.

由于 P 波和 S 波以不同但相当恒定的速度传播，它们到达的间隔与到震源或初始破裂点的距离成比例地增加。

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P-waves are sometimes known as primary waves, because they travel faster through the Earth and so are the first to arrive at monitoring stations.

P波有时被看作纵波，因为它们以更快的传递速度穿越地球内部，因此最先被地震监测站台发现。

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For P&G’s management, the biggest appeal may be the cost savings, which rumours suggest may be 15-25% of its previous travel budget.

对于保洁管理层来说，该系统最大的优点应该是节省成本，据说只有从前差旅预算的15%到25%。

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"Haitian nationals will be able to remain in the United States legally, be able to obtain authorization to work legally in the United States, be eligible to obtain permission to travel outside the United States, and return to their T.P.S.status."

VOA: special.2010.02.01

We believe 2010, with the explosion of leisure (and thrifty business) traffic, is the year that has proven Tony Fernandes' premise correct, that Asia needed and wanted a low-cost travel alternative (see p. 56).

FORBES: Side Lines

Massachusetts, Connecticut and Rhode Island imposed travel bans until 4 p.m. to keep cars off the road and let plows do their work, and the National Guard helped clear highways in Connecticut, where more than 240 auto accidents were reported.

WSJ: Northeast trying to get back on track after storm

Massachusetts, Connecticut and Rhode Island imposed travel bans until 4 p.m. to keep cars off the road and let plows do their work, and the National Guard helped clear highways in Connecticut, where more than 240 car accidents were reported.

NPR: The Big Dig-Out: New England, NY Slammed With Snow